The invention discloses an air conditioner. The air conditioner comprises a motor, air channel foam, a sealing part and a back panel. The air channel foam is provided with a matched hole, and a motor shaft of the motor penetrates through the matched hole. The sealing part is arranged between a front end cover of the motor and the air channel foam, the sealing part is provided with an assembling hole, and the motor shaft of the motor penetrates through the assembling hole. The motor is installed on the back panel. According to the air conditioner, the sealing part is arranged between the front end cover of the motor and the air channel foam, in this way, a gap between the motor and the air channel foam can be effectively sealed, cold air is prevented from leaking out of a gap between the matched hole and the motor shaft, the loss of cold energy is reduced, energy can be saved, and the overall machine energy efficiency of the air conditioner is improved.